Ensemble Stars Music is a solid, rewarding game to play if:
- you like rhythm games
- you can take bad gacha rolls in stride
- you have a fair amount of idle time to play bits of it
- you can love characters a healthy amount

And it is a very bad game to play if:
- an unlucky gacha roll can be devastating
- you feel like you should often spend money on getting (or maybe getting) jpgs of anime characters
- you feel a compulsion to get the latest card of your faves
- you don't have much idle time to get the free in-game currencies/participate in events

And I am 100% serious on that. No gacha game deserves $100 for a card of your fave.